History repeats itself.
Washington (CNN)Defense officials tell CNN there was deep and growing discomfort among some in the Pentagon even before President Donald Trump announced Monday that he is ready to deploy the military to enforce order inside the United States.

As tear gas wafted through the air in Lafayette Park across from the White House, Trump announced from the Rose Garden that if state or city leaders refuse “to take the actions that are necessary to defend the life and property of their residents,” he will invoke the Insurrection Act, an 1807 law that allows a president to deploy the US military to suppress civil disorder.
Read more, http://www.cnn.com/2020/06/01/politics/troops-deploying-washington-dc/index.html